Riley O'Brien is a Bronze 72 OVR Closer card for the Cardinals, part of the Live set in MLB The Show's Diamond Dynasty. He throws right-handed. The card was added to Diamond Dynasty in April 2026.

On the mound, Riley O'Brien works with a 3-pitch arsenal led by a 95 mph Sinker and a 90 mph Slider. His pitching ratings include 99 Velocity, 56 Control, and 98 Break. The profile favors a movement-heavy arsenal built to miss bats. Notable quirks include Outlier I.

On the Diamond Dynasty market, Riley O'Brien currently buys for about 63 stubs, with sell orders near 0 stubs. Over the past 7 days the buy price has climbed roughly 19%. Its quick-sell value of 12 stubs sits at or above the sell price, making it quick-sell viable. DiamondOps suggests waiting for a better entry point.

OpScore is DiamondOps' composite rating of a card's in-game performance value. Riley O'Brien earns an OpScore of 65.7 on Legend difficulty, ranking #1104 among all cards and #59 among Closers.